Manufacture of textured textile yarns



y 1968 L. HORVATH 3,382,657

MANUFACTURE OF TEXTURED TEXTILE YARNS Filed Jan. 17. 1966 W is 14 v 17 I N VEN TOR.

luau/6 Ham 47W BY 4%;m/MAWL M' m United States Patent 3,382,657 MANUFACTURE OF TEXTURED TEXTILE YARNS Ludwig Horvath, Saint Gall, Switzerland, assignor to Heberlein Patent Corporation, New York, N.Y., a corporation of N ew York Fiied Jan. 17, 1966, Ser. No. 521,120 Claims priority, application s/vgistzerland, Feb. 17, 1965,

7 Claims. (CI. 57-34) ABSTRACT OF THE DISCLOSURE Process and apparatus for the production of textured textile yarns by mutually temporarily highly twisting a number of yarns and heat setting the mechanical deformation of the yarns while in the highly twisted state wherein guide means are provided to form at least one sharp edge at the assembly point at which the yarns to be mutually twisted are brought together.

This invention relates to a method and apparatus for the production of textured textile yarns.

It is known to manufacture elastic textured textile yarns by temporarily highly twisting thermoplastic multifilament yarns by means of a false twist device and heat setting the yarn while in the highly twisted state. It is also known to mutually highly twist multifilament or monofilament yarns by a false twisting device, to heat set the yarns while in the highly twisted state and, after untwisting, to separate the yarns. While this method of texturization has thus far been quite satisfactory, nevertheless, those skilled in the art have sought ways to improve upon it. Thus, where that method has been us d, some difiiculties have been noted in the separation of the yarns and the resultant product was not always completely suitable for all applications due to lack of uniformity of texturization and the intermittent occurrence of lengths of yarn that are not entirely untwisted and, hence, less voluminous than the remainder. Due to the increase of the total titer of assembled yarns, the maximum number of turns per meter in the high twisting step is essentially lower than when single yarns are processed, the number of turns of the twist imparting member being the same in each case. Furthermore, because of unsteady conditions due to lateral or sidewise movement of the yarns being assembled according to known processes, a stationary yarn assembly point is not attained and even the aforementioned relatively low maximum number of turns could not be attained wherefore the eifect of the torsional and compressional forces onto the individual filaments has not been suificient to yield a pronounced texturization.

I have conceived by my invention a process and apparatus for overcoming the foregoing diificulties and disadvantages and by reason of which I am able to produce textured yarns of improved quality.

Thus, I contribute as an important aspect of my invention, a process for the manufacture of textured textile yarns by mutual temporary high-twisting of a number of yarns and heat-setting of the mechanical deformation in the high-twisted state, which is characterized in that the single yarns are separately led through a yarn forwarding device positoined upstream or in advance of their assembling point in the process direction, and then over the lateral faces of a guiding member forming at least one sharp edge running through the yarn assembling point. The invention, furthermore, concerns an apparatus for the execution of the process which is characterized in that, before the yarn assembling point, a yarn forwarding member for the separate introduction of the yarns is arranged "ice and that between this forwarding member and the yarn assembling point a guiding member having at least one sharp edge is stationarily arranged. The guiding member may take the form of a wedge or consist of several wedgeshaped parts, the edges of which lie in the same plane and intersect at one point.

The guiding member may furthermore advantageously consist of a hard material with a low frictional resistance, e.g. highly polished steel, ceramic material, etc.

According to my invention, it is possible to assemble the yarns so that the filaments do not get intermingled with each other in such a way that they will remain attached to one another when being separated and that no lengths of yarn only partially untwisted and thus of less volume than the rest of the yarn will be formed in the separated yarn ends. Furthermore, according to my invention, a very quiet and steady running of the yarns to be assembled is obtained, and therefore a stationary assembling point may be obtained so that the maximum number of turns per meter may be achieved by high-twisting. Because of an increase of the torsional and compressive forces a more intensive texturization and a greater bulk may be produced in the yarn than in known methods of mutual false-twisting of several yarns.

By mutual temporary high-twisting according to the invention, various elfects are obtained. On one hand, due to the doubling or multiplication of the yarns, a decrease of the optimum number of turns per meter applicable in temporary high-twisting and, consequently, also a decrease of the torsional forces on the single yarns occurs, whereby a more or less substantial diminution of the extensibility of the textured yarns is caused. This is very desirable for many applications.

Furthermore, the speed of the yarns and, consequently, the production of textured yarns may be considerably increased without increasing the number of turns of the twist imparter.

The process according to the present invention may be used equally well on conventional false-twisting machines or according to the so-called spindleless process, wherein two or more yarns coming from spools are mutually plytwisted along a certain length, submitted to heat-setting in this state and then separated by continuously separating and winding them on spools.

The process according to my invention is especially suitable for the texturization of endless yarns or filament bundles as well as of staple fibre yarns consisting of thermoplastic materials, especially polyamides (polyhexamethyleneadipamide, condensation products of epsilonaminocaproic acid or ll-arninounde-canoic acid), polyesters (polyethylene glycol terephthalate), materials on a vinyl basis (polyacrylonitrile) or polyolefines, furthermore, cellulose acetate as well as mixed spun yarns of thermoplastic fibres and non-thermoplastic natural fibres.

There has thus been outlined rather broadly, the more important features of the invention in order that the detailed description thereof that follows may be better understood and in order that the present contribution to the art may be better appreciated. There are, of course, additional features of the invention that will be described hereinafter and which will form the subject of the claims appended hereto. Those skilled in the art will appreciate that the conception upon which this disclosure is based may readily be utilized as a basis for the designing of other structures for carrying out the several purposes of the invention. It is important, therefore, that the claims be regarded as including such equivalent construction as do not depart from the spirit and scope of the invention.

A specific embodiment of the invention has been chosen for purposes of illustration and description, and is shown in the accompanying drawings, forming a part of the specification, wherein:

FIG. 1 schematically shows a device in accordance with my invention for assembling two yarns;

FIG. 2 is similar to FIG. 1 but illustrates a device for assembling four yarns;

FIG. 3 shows a lateral section of the latter device; and

according to FIG. 1, and Tables III and IV show examples of the assembling of four yarns according to FIGS. 2 to 4, whereby, in examples according to Tables I and III the yarns are temporarily mutually ply-twisted by means of a false-twisting device, whereas in the examples according to Tables II and IV, a temporary ply-twisting is effected according to the spindleless process.

TABLE I Titer in T urns Heat-Setting- Crimp Production of Example Fibre Material denier/ rer Yarn running Contraction, single yarns per filaments meter speed, m./min. Temp, Duration, Percent twisting position C. see. in 1n./n1in.

1 Polyarnide 66 2X70/23 2,150 98 225 1.5 60 196 Polyamide (L 2x60/20 2, 350 90 185 1. 7 55 180 3 Polyester 2x150/30 1, 460 150 240 1 40 300 TABLE II Titer in Turns Heat-Setting- Crimp Production of Example Fibre Material dcnier/ per Yarn running Contraction, single yarns per laments meter speed, rn./rnm. Temp, Duration, Percent twisting position C. see. in m./min.

Iolyamide 66 23:30/10 3, 200 200 230 10.5 60 400 Polyamide 66.. 23210/34 1, 250 200 240 0. .3 400 6 Polypropylene 2x6U/20 2, 350 200 160 0.5 400 TABLE III Titcr in Tunis Heat-Setting- Crimp Production of Example Fibre Material denier/ per Yarn running Contraction, single yarns per filaments n eter speed, mJmm. Temp, Duration, Percent twisting position C. see. in mJnzin.

7 Polyamide 66 MiG/23 2,350 145 235 1 550 8" Polyamido 6. 4xGG/20 1,600 130 190 1.15 40 520 9 Iclyester. HMO/30 1,050 200 245 O. 75 30 800 TABLE IV Titer in Turns Heat-Setting- Crimp Production of Example Fibre Material denter/ per Yarn running Contract on, Single yarns per filaments meter speed, m./mm. Temp, Duration, Percent twisting po ition C. see. in m./min.

10 Polyamide 66 4x30/10 2,350 220 230 0.5 300 11 Polyamide G6" 4X2lO/34 850 200 260 0. 5 20 300 12 P lypropylene 4x60/20 1, 600 200 1 5 800 FIG. 4 shows perspectively the guiding member for the I claim:

assembling of four yarns.

According to FIG. 1, the yarns 1 and 2 coming from delivery spools (not shown) are led through a pair of rollers 3, 4 serving as forwarding means and thereupon reach a stationary wedge 5 consisting of polished steel, for example, each yarn running over a lateral face of the latter. On the downstream edge of the wedge 5 is an assembling point 6 at which the yarns 1 and 2 come together and are mutually ply-twisted along the distance between that point and point 7. Vlhen using a usual falsetwisting machine, the twister is positioned at point 7 and in application of the spindleless process a yarn separating device, as it is e.g. described in US. applications Ser. Nos. 331,568, 377,845, and 377,911, is positioned at point 7.

Along the distance between points 6 and 7, a heating device 8 is provided, by means of which the highly plytwisted yarns are temporarily brought into a plastic state, whereupon the setting of the spiral-like deformation takes place by resolidifying of the material downstream of the heater.

According to FIGS. 2-4, four yarns 9, 1t), 11, 12 coming from delivery spools (not shown) are led through a pair of rollers 3, 4 at a certain mutual distance, and thereafter over the yarn guiding member 13, which consists of two intersecting wedge-shaped parts 14, 15 and the edges 1d, 17 of which are situated perpendicularly to each other in the same plane and intersect each other at point 18. The ply-twisted yarns thereafter pass through the heating device 8 and are again separated at point 7.

In the following tables, a number of examples of the process according to the invention are represented. Tables I and II show examples for the asset hly of two yarns ll. An improved process for the production of textured textile yarns comprising: mutually temporarily highly twisting a number of yarns and heat setting the mechanical deformation of the yarns while in the highly twisted state, characterized by the step of leading individual yarns from a supply source separately over lateral surfaces of guide means converging at an assembly point at which the yarns to be mutually twisted are brought together.

2. An improved process for the production of textured textile yarns comprising: mutually temporarily highly twisting a number of yarns and heat setting the mechanical deformation of the yarns while in the highly twisted state, characterized by the step of leading individual yarns from a supply source separately over lateral surfaces of guide means forming at least one sharp edge running through an assembly point at which the yarns to be mutually twisted are brought together.

3. In apparatus of the class described, forwarding means for a number of yarns, means for mutually highly false twisting said yarns together, means for heat setting said yarns while in the highly twisted condition, and guide means having lateral surfaces over which the individual yarns pass, said surfaces converging at a point at which the yarns come together and are twisted.

4. In apparatus of the class described, forwarding means for a number of yarns, means for mutually highly false twisting said yarns together, means for heat setting said yarns while in the highly twisted condition, and guide means having lateral surfaces over which the individual yarns pass, said surfaces forming at least one sharp edge running through an assembly point at which the yarns come together and are twisted.

5. Apparatus according to claim 3 characterized in that said guide means is a wedge shaped member having converging surfaces the apex of which is located at the point at which the yarns come together.

6. In apparatus of the class described, forwarding means for a number of yarns, means for mutually highly false twisting said yarns together, means for heat setting said yarns while in the highly twisted condition, and guide means comprising several wedge shaped elements each having lateral surfaces over which the individual yarns I pass, said surfaces of each element converging to form, an edge each lying in the same plane and intersecting one another.

7. In apparatus of the class described, forwarding means for a number of yarns, means for mutually highly means formed of hard material having a low frictional resistance and having lateral surfaces over which the individual yarns pass, said surfaces converging at a point at which the yarns come together and are twisted.

References Cited UNITED STATES PATENTS 1,117,940 11/1914 Boyd 57-106 1,590,325 6/1926 Sgritta 57106 2,342,009 2/ 1944 Reynolds 57106 2,346,358 4/1944 Busse 57-406 2,540,833 2/1951 Pitt et al 57--106 2,963,848 12/1960 Finlayson et al 5734 3,261,155 7/1966 Kunzle S7-34 FRANK J. COHEN, Primary Examiner. 

